Re: [PATCH next 2/2] spi: spi-qpic-snand: add support for 8 bits ECC strength

Gabor Juhos
2025-05-05T13:21:55Z

2025. 05. 05. 13:17 keltezéssel, Md Sadre Alam írta:
>
>

[...]

>>    [ 2720.344163] mtd_stresstest: 8192 operations done
>>    [ 2761.645640] mtd_stresstest: 9216 operations done
>>    [ 2791.760534] mtd_stresstest: finished, 10000 operations done
>>    [ 2791.760817] =================================================
>>    #
> Could you please run biterror test "mtd_nandbiterrs" with the same device, since
> you are adding 8-bit ECC support.

Sure, here is the result:

# insmod mtd_test
# for i in $(seq 0 4); do insmod mtd_nandbiterrs; done
[ 45.405610]
[ 45.405638] ==================================================
[ 45.406164] mtd_nandbiterrs: MTD device: 0
[ 45.411807] mtd_nandbiterrs: MTD device size 268435456, eraseblock=131072,
page=2048, oob=128
[ 45.415990] mtd_nandbiterrs: Device uses 1 subpages of 2048 bytes
[ 45.424495] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 45.434686] mtd_nandbiterrs: incremental biterrors test
[ 45.436653] mtd_nandbiterrs: write_page
[ 45.442634] mtd_nandbiterrs: rewrite page
[ 45.446408] mtd_nandbiterrs: read_page
[ 45.450346] mtd_nandbiterrs: verify_page
[ 45.453320] mtd_nandbiterrs: Successfully corrected 0 bit errors per subpage
[ 45.457405] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 45.464431] mtd_nandbiterrs: rewrite page
[ 45.470216] mtd_nandbiterrs: read_page
[ 45.473852] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 45.476909] mtd_nandbiterrs: verify_page
[ 45.483090] mtd_nandbiterrs: Successfully corrected 1 bit errors per subpage
[ 45.487098] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 45.494111] mtd_nandbiterrs: rewrite page
[ 45.499850] mtd_nandbiterrs: read_page
[ 45.503557] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 45.506597] mtd_nandbiterrs: verify_page
[ 45.512777] mtd_nandbiterrs: Successfully corrected 2 bit errors per subpage
[ 45.516768] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 45.523810] mtd_nandbiterrs: rewrite page
[ 45.529586] mtd_nandbiterrs: read_page
[ 45.533224] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 45.536305] mtd_nandbiterrs: verify_page
[ 45.542464] mtd_nandbiterrs: Successfully corrected 3 bit errors per subpage
[ 45.546457] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 45.553470] mtd_nandbiterrs: rewrite page
[ 45.559244] mtd_nandbiterrs: read_page
[ 45.562914] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 45.565991] mtd_nandbiterrs: verify_page
[ 45.572153] mtd_nandbiterrs: Successfully corrected 4 bit errors per subpage
[ 45.576142] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 45.583158] mtd_nandbiterrs: rewrite page
[ 45.588927] mtd_nandbiterrs: read_page
[ 45.592599] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 45.595680] mtd_nandbiterrs: verify_page
[ 45.601840] mtd_nandbiterrs: Successfully corrected 5 bit errors per subpage
[ 45.605831] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 45.612846] mtd_nandbiterrs: rewrite page
[ 45.618618] mtd_nandbiterrs: read_page
[ 45.622286] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 45.625434] mtd_nandbiterrs: verify_page
[ 45.631528] mtd_nandbiterrs: Successfully corrected 6 bit errors per subpage
[ 45.635517] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 45.642533] mtd_nandbiterrs: rewrite page
[ 45.648303] mtd_nandbiterrs: read_page
[ 45.651975] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 45.655055] mtd_nandbiterrs: verify_page
[ 45.661215] mtd_nandbiterrs: Successfully corrected 7 bit errors per subpage
[ 45.665207] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 45.672221] mtd_nandbiterrs: rewrite page
[ 45.677987] mtd_nandbiterrs: read_page
[ 45.681663] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 45.684741] mtd_nandbiterrs: verify_page
[ 45.690902] mtd_nandbiterrs: Successfully corrected 8 bit errors per subpage
[ 45.694892] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 45.701908] mtd_nandbiterrs: rewrite page
[ 45.707678] mtd_nandbiterrs: read_page
[ 45.711351] mtd_nandbiterrs: error: read failed at 0x0
[ 45.714431] mtd_nandbiterrs: After 9 biterrors per subpage, read reported
error -74
[ 45.722975] mtd_nandbiterrs: finished successfully.
[ 45.727101] ==================================================
[ 46.200485]
[ 46.200512] ==================================================
[ 46.201039] mtd_nandbiterrs: MTD device: 0
[ 46.206751] mtd_nandbiterrs: MTD device size 268435456, eraseblock=131072,
page=2048, oob=128
[ 46.210763] mtd_nandbiterrs: Device uses 1 subpages of 2048 bytes
[ 46.219377] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 46.228941] mtd_nandbiterrs: incremental biterrors test
[ 46.231522] mtd_nandbiterrs: write_page
[ 46.237524] mtd_nandbiterrs: rewrite page
[ 46.241199] mtd_nandbiterrs: read_page
[ 46.245175] mtd_nandbiterrs: verify_page
[ 46.248195] mtd_nandbiterrs: Successfully corrected 0 bit errors per subpage
[ 46.252254] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 46.259317] mtd_nandbiterrs: rewrite page
[ 46.265230] mtd_nandbiterrs: read_page
[ 46.268955] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 46.271784] mtd_nandbiterrs: verify_page
[ 46.277987] mtd_nandbiterrs: Successfully corrected 1 bit errors per subpage
[ 46.281941] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 46.288985] mtd_nandbiterrs: rewrite page
[ 46.294803] mtd_nandbiterrs: read_page
[ 46.298414] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 46.301472] mtd_nandbiterrs: verify_page
[ 46.307677] mtd_nandbiterrs: Successfully corrected 2 bit errors per subpage
[ 46.311629] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 46.318686] mtd_nandbiterrs: rewrite page
[ 46.324470] mtd_nandbiterrs: read_page
[ 46.328100] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 46.331159] mtd_nandbiterrs: verify_page
[ 46.337371] mtd_nandbiterrs: Successfully corrected 3 bit errors per subpage
[ 46.341316] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 46.348365] mtd_nandbiterrs: rewrite page
[ 46.354123] mtd_nandbiterrs: read_page
[ 46.357787] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 46.360846] mtd_nandbiterrs: verify_page
[ 46.367047] mtd_nandbiterrs: Successfully corrected 4 bit errors per subpage
[ 46.371003] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 46.378046] mtd_nandbiterrs: rewrite page
[ 46.383794] mtd_nandbiterrs: read_page
[ 46.387475] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 46.390534] mtd_nandbiterrs: verify_page
[ 46.396747] mtd_nandbiterrs: Successfully corrected 5 bit errors per subpage
[ 46.400691] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 46.407733] mtd_nandbiterrs: rewrite page
[ 46.413483] mtd_nandbiterrs: read_page
[ 46.417190] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 46.420222] mtd_nandbiterrs: verify_page
[ 46.426419] mtd_nandbiterrs: Successfully corrected 6 bit errors per subpage
[ 46.430379] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 46.437423] mtd_nandbiterrs: rewrite page
[ 46.443168] mtd_nandbiterrs: read_page
[ 46.446875] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 46.449908] mtd_nandbiterrs: verify_page
[ 46.456109] mtd_nandbiterrs: Successfully corrected 7 bit errors per subpage
[ 46.460066] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 46.467109] mtd_nandbiterrs: rewrite page
[ 46.472888] mtd_nandbiterrs: read_page
[ 46.476569] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 46.479597] mtd_nandbiterrs: verify_page
[ 46.485796] mtd_nandbiterrs: Successfully corrected 8 bit errors per subpage
[ 46.489753] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 46.496797] mtd_nandbiterrs: rewrite page
[ 46.502540] mtd_nandbiterrs: read_page
[ 46.506249] mtd_nandbiterrs: error: read failed at 0x0
[ 46.509284] mtd_nandbiterrs: After 9 biterrors per subpage, read reported
error -74
[ 46.517867] mtd_nandbiterrs: finished successfully.
[ 46.521956] ==================================================
[ 47.150313]
[ 47.150341] ==================================================
[ 47.150867] mtd_nandbiterrs: MTD device: 0
[ 47.156564] mtd_nandbiterrs: MTD device size 268435456, eraseblock=131072,
page=2048, oob=128
[ 47.160591] mtd_nandbiterrs: Device uses 1 subpages of 2048 bytes
[ 47.169201] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 47.178778] mtd_nandbiterrs: incremental biterrors test
[ 47.181350] mtd_nandbiterrs: write_page
[ 47.187334] mtd_nandbiterrs: rewrite page
[ 47.191016] mtd_nandbiterrs: read_page
[ 47.194997] mtd_nandbiterrs: verify_page
[ 47.198019] mtd_nandbiterrs: Successfully corrected 0 bit errors per subpage
[ 47.202081] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 47.209132] mtd_nandbiterrs: rewrite page
[ 47.214962] mtd_nandbiterrs: read_page
[ 47.218554] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 47.221612] mtd_nandbiterrs: verify_page
[ 47.227814] mtd_nandbiterrs: Successfully corrected 1 bit errors per subpage
[ 47.231769] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 47.238816] mtd_nandbiterrs: rewrite page
[ 47.244574] mtd_nandbiterrs: read_page
[ 47.248242] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 47.251300] mtd_nandbiterrs: verify_page
[ 47.257499] mtd_nandbiterrs: Successfully corrected 2 bit errors per subpage
[ 47.261457] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 47.268504] mtd_nandbiterrs: rewrite page
[ 47.274301] mtd_nandbiterrs: read_page
[ 47.277930] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 47.280987] mtd_nandbiterrs: verify_page
[ 47.287187] mtd_nandbiterrs: Successfully corrected 3 bit errors per subpage
[ 47.291145] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 47.298191] mtd_nandbiterrs: rewrite page
[ 47.303951] mtd_nandbiterrs: read_page
[ 47.307619] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 47.310675] mtd_nandbiterrs: verify_page
[ 47.316876] mtd_nandbiterrs: Successfully corrected 4 bit errors per subpage
[ 47.320832] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 47.327875] mtd_nandbiterrs: rewrite page
[ 47.333629] mtd_nandbiterrs: read_page
[ 47.337305] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 47.340362] mtd_nandbiterrs: verify_page
[ 47.346563] mtd_nandbiterrs: Successfully corrected 5 bit errors per subpage
[ 47.350519] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 47.357561] mtd_nandbiterrs: rewrite page
[ 47.363310] mtd_nandbiterrs: read_page
[ 47.367021] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 47.370050] mtd_nandbiterrs: verify_page
[ 47.376248] mtd_nandbiterrs: Successfully corrected 6 bit errors per subpage
[ 47.380207] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 47.387250] mtd_nandbiterrs: rewrite page
[ 47.392996] mtd_nandbiterrs: read_page
[ 47.396703] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 47.399737] mtd_nandbiterrs: verify_page
[ 47.405936] mtd_nandbiterrs: Successfully corrected 7 bit errors per subpage
[ 47.409894] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 47.416938] mtd_nandbiterrs: rewrite page
[ 47.422685] mtd_nandbiterrs: read_page
[ 47.426387] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 47.429424] mtd_nandbiterrs: verify_page
[ 47.435637] mtd_nandbiterrs: Successfully corrected 8 bit errors per subpage
[ 47.439582] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 47.446624] mtd_nandbiterrs: rewrite page
[ 47.452369] mtd_nandbiterrs: read_page
[ 47.456080] mtd_nandbiterrs: error: read failed at 0x0
[ 47.459111] mtd_nandbiterrs: After 9 biterrors per subpage, read reported
error -74
[ 47.467699] mtd_nandbiterrs: finished successfully.
[ 47.471784] ==================================================
[ 48.080311]
[ 48.080339] ==================================================
[ 48.080866] mtd_nandbiterrs: MTD device: 0
[ 48.086560] mtd_nandbiterrs: MTD device size 268435456, eraseblock=131072,
page=2048, oob=128
[ 48.090590] mtd_nandbiterrs: Device uses 1 subpages of 2048 bytes
[ 48.099204] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 48.108765] mtd_nandbiterrs: incremental biterrors test
[ 48.111353] mtd_nandbiterrs: write_page
[ 48.117325] mtd_nandbiterrs: rewrite page
[ 48.121017] mtd_nandbiterrs: read_page
[ 48.124996] mtd_nandbiterrs: verify_page
[ 48.128017] mtd_nandbiterrs: Successfully corrected 0 bit errors per subpage
[ 48.132080] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 48.139131] mtd_nandbiterrs: rewrite page
[ 48.144881] mtd_nandbiterrs: read_page
[ 48.148552] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 48.151611] mtd_nandbiterrs: verify_page
[ 48.157816] mtd_nandbiterrs: Successfully corrected 1 bit errors per subpage
[ 48.161768] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 48.168891] mtd_nandbiterrs: rewrite page
[ 48.174571] mtd_nandbiterrs: read_page
[ 48.178241] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 48.181299] mtd_nandbiterrs: verify_page
[ 48.187500] mtd_nandbiterrs: Successfully corrected 2 bit errors per subpage
[ 48.191455] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 48.198506] mtd_nandbiterrs: rewrite page
[ 48.204299] mtd_nandbiterrs: read_page
[ 48.207931] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 48.210985] mtd_nandbiterrs: verify_page
[ 48.217187] mtd_nandbiterrs: Successfully corrected 3 bit errors per subpage
[ 48.221142] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 48.228188] mtd_nandbiterrs: rewrite page
[ 48.233950] mtd_nandbiterrs: read_page
[ 48.237617] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 48.240673] mtd_nandbiterrs: verify_page
[ 48.246872] mtd_nandbiterrs: Successfully corrected 4 bit errors per subpage
[ 48.250831] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 48.257875] mtd_nandbiterrs: rewrite page
[ 48.263631] mtd_nandbiterrs: read_page
[ 48.267303] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 48.270361] mtd_nandbiterrs: verify_page
[ 48.276560] mtd_nandbiterrs: Successfully corrected 5 bit errors per subpage
[ 48.280531] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 48.287592] mtd_nandbiterrs: rewrite page
[ 48.293338] mtd_nandbiterrs: read_page
[ 48.297030] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 48.300049] mtd_nandbiterrs: verify_page
[ 48.306247] mtd_nandbiterrs: Successfully corrected 6 bit errors per subpage
[ 48.310205] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 48.317250] mtd_nandbiterrs: rewrite page
[ 48.322994] mtd_nandbiterrs: read_page
[ 48.326705] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 48.329736] mtd_nandbiterrs: verify_page
[ 48.335935] mtd_nandbiterrs: Successfully corrected 7 bit errors per subpage
[ 48.339892] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 48.346936] mtd_nandbiterrs: rewrite page
[ 48.352633] mtd_nandbiterrs: read_page
[ 48.356391] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 48.359423] mtd_nandbiterrs: verify_page
[ 48.365626] mtd_nandbiterrs: Successfully corrected 8 bit errors per subpage
[ 48.369581] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 48.376627] mtd_nandbiterrs: rewrite page
[ 48.382322] mtd_nandbiterrs: read_page
[ 48.386077] mtd_nandbiterrs: error: read failed at 0x0
[ 48.389110] mtd_nandbiterrs: After 9 biterrors per subpage, read reported
error -74
[ 48.397695] mtd_nandbiterrs: finished successfully.
[ 48.401783] ==================================================
[ 48.940558]
[ 48.940586] ==================================================
[ 48.941112] mtd_nandbiterrs: MTD device: 0
[ 48.946811] mtd_nandbiterrs: MTD device size 268435456, eraseblock=131072,
page=2048, oob=128
[ 48.950837] mtd_nandbiterrs: Device uses 1 subpages of 2048 bytes
[ 48.959448] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 48.969014] mtd_nandbiterrs: incremental biterrors test
[ 48.971596] mtd_nandbiterrs: write_page
[ 48.977594] mtd_nandbiterrs: rewrite page
[ 48.981277] mtd_nandbiterrs: read_page
[ 48.985247] mtd_nandbiterrs: verify_page
[ 48.988269] mtd_nandbiterrs: Successfully corrected 0 bit errors per subpage
[ 48.992327] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 48.999428] mtd_nandbiterrs: rewrite page
[ 49.005508] mtd_nandbiterrs: read_page
[ 49.008836] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 49.011858] mtd_nandbiterrs: verify_page
[ 49.018061] mtd_nandbiterrs: Successfully corrected 1 bit errors per subpage
[ 49.022015] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 49.029058] mtd_nandbiterrs: rewrite page
[ 49.034848] mtd_nandbiterrs: read_page
[ 49.038516] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 49.041545] mtd_nandbiterrs: verify_page
[ 49.047755] mtd_nandbiterrs: Successfully corrected 2 bit errors per subpage
[ 49.051702] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 49.058760] mtd_nandbiterrs: rewrite page
[ 49.064565] mtd_nandbiterrs: read_page
[ 49.068203] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 49.071232] mtd_nandbiterrs: verify_page
[ 49.077432] mtd_nandbiterrs: Successfully corrected 3 bit errors per subpage
[ 49.081389] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 49.088432] mtd_nandbiterrs: rewrite page
[ 49.094197] mtd_nandbiterrs: read_page
[ 49.097889] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 49.100919] mtd_nandbiterrs: verify_page
[ 49.107121] mtd_nandbiterrs: Successfully corrected 4 bit errors per subpage
[ 49.111077] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 49.118137] mtd_nandbiterrs: rewrite page
[ 49.123892] mtd_nandbiterrs: read_page
[ 49.127576] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 49.130608] mtd_nandbiterrs: verify_page
[ 49.136808] mtd_nandbiterrs: Successfully corrected 5 bit errors per subpage
[ 49.140764] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 49.147807] mtd_nandbiterrs: rewrite page
[ 49.153607] mtd_nandbiterrs: read_page
[ 49.157268] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 49.160294] mtd_nandbiterrs: verify_page
[ 49.166496] mtd_nandbiterrs: Successfully corrected 6 bit errors per subpage
[ 49.170452] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 49.177498] mtd_nandbiterrs: rewrite page
[ 49.183253] mtd_nandbiterrs: read_page
[ 49.186974] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 49.189983] mtd_nandbiterrs: verify_page
[ 49.196194] mtd_nandbiterrs: Successfully corrected 7 bit errors per subpage
[ 49.200140] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 49.207182] mtd_nandbiterrs: rewrite page
[ 49.212895] mtd_nandbiterrs: read_page
[ 49.216671] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 49.219670] mtd_nandbiterrs: verify_page
[ 49.225872] mtd_nandbiterrs: Successfully corrected 8 bit errors per subpage
[ 49.229827] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 49.236871] mtd_nandbiterrs: rewrite page
[ 49.242629] mtd_nandbiterrs: read_page
[ 49.246348] mtd_nandbiterrs: error: read failed at 0x0
[ 49.249356] mtd_nandbiterrs: After 9 biterrors per subpage, read reported
error -74
[ 49.257958] mtd_nandbiterrs: finished successfully.
[ 49.262029] ==================================================
#

Regards,
Gabor